BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from part, supplier, partsupp, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and p_size = 10 and p_type like '%TIN' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' and ps_supplycost = ( select min(ps_supplycost) from partsupp, supplier, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=822932.93..822932.94 rows=1 width=190) (actual time=27121.456..27121.495 rows=100 loops=1) Buffers: shared hit=1638772 read=216764 written=298 -> Sort (cost=822932.93..822932.94 rows=1 width=190) (actual time=27121.454..27121.472 rows=100 loops=1) Sort Key: public.supplier.s_acctbal, public.nation.n_name, public.supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1638772 read=216764 written=298 -> Merge Join (cost=395374.30..822932.92 rows=1 width=190) (actual time=20415.324..27108.505 rows=4564 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1626 Buffers: shared hit=1638764 read=216764 written=298 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7996 width=30) (actual time=0.027..3399.979 rows=7869 loops=1) Filter: (((p_type)::text ~~ '%TIN'::text) AND (p_size = 10)) Rows Removed by Filter: 1992131 Buffers: shared hit=7262 read=39479 written=275 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=20414.904..21075.540 rows=1586953 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1478873 read=174195 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.059..17000.383 rows=1586960 loops=1) Buffers: shared hit=1478873 read=174195 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.047..231.504 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.013 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.038..200.462 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.009..67.773 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.016..0.016 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 2kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.004..0.005 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.00..10.44 rows=80 width=12) (actual time=0.051..0.812 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1476692 read=174195 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.276..0.276 rows=1 loops=6190) Buffers: shared hit=152629 read=3090 written=23 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.186..0.271 rows=2 loops=6190) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152629 read=3090 written=23 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.013..0.015 rows=1 loops=6190) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6190 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.118..0.252 rows=4 loops=6190) Buffers: shared hit=146439 read=3090 written=23 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.104..0.211 rows=4 loops=6190) Buffers: shared hit=96919 read=3090 written=23 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.070..0.074 rows=4 loops=6190) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22483 read=3090 written=23 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.032..0.032 rows=1 loops=24760) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=74436 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=24760) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=49520 Total runtime: 27174.895 ms (67 rows) COMMIT; COMMIT